June Gloom 2025. Overcast mornings are a great time to experience santa monica mountain trails without the scorching summer sun. The lingering “june gloom” and “may gray” that brought unusually persistent cool and cloudy overcast weather to southern california have been hard to miss.

Alex tardy, with the national weather service san diego, said there. The air high up in the atmosphere is warming at a rate much faster than the air directly over the ocean itself, which is holding on to those cool winter temperatures.